Chemistry

posted by .

Based on the following chemical equation answer the question below show all your calculation

The balanced chemical reaction of iodine with hydrogen sulfide h2s(g)+i2(s)-----2HI(g) + S(s)

(a) Based on the above chemically balanced equation, how many grams of HI should be produced from the reaction of 25.0g of H2S when there is excess amount of I2?

(b) Actually 30.0g of HI is produced in this reaction what is the percent yield of HI?

  • Chemistry -

    I worked this one or one almost the same yesterday. Look that up and follow the steps. The same applies to your posts just below.

  • Chemistry -

    It's not clear to me at all. Can you explain it again please

  • Chemistry -

    In the future, try to avoid using general statements that a problem is not clear to you. Be specific. What did you not understand? What is troubling about the process? As it stands all I can do is rework the problem and if you didn't understand it the first time it the chances are poor for the secolnd. It just takes up your time and my time to repeat a process that didn't work. However, I'll go through it in a little more detail.
    These stoichiometry problems are a four step process.
    1. Write and balance the equation.
    H2S + I2 ==> 2HI + S

    2. Convert 25.0 g H2S to mols. mols = grams/molar mass.
    mols H2S = 25.0/about 34 = about0.735 but you need to confirm that with a more accurate number.

    3. Using the coefficients in the balanced equation, convert mols H2S to mols HI.
    0.735 mols H2S x (2 mols HI/1 mol H2S) = 0.735 x 2/1 = 1.47

    4. Now convert mols HI to grams. g = mols x molar mass.
    g HI = 1.47 x 128 = 188 grams HI. This is the theoretical yield and is where most of these problems stop.

    5. This one tells you the actual yield is 30.0 g in the b part and want to know the percent yield.
    %yield = (actual yield/theo yield)*100
    = (30/188)* 100 = about 16% yield.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry - please help

    1. Write the balanced chemical equation for the single displacement reaction of magnesium and sodium thiosulfate. Is this right?
  2. Chemistry

    The electrolysis (decomposition) of water produces hydrogen gas at the rate of 30.0 mL/min. A) Write a balanced chemical equation for this reaction and include phase designations. 2H2O(aq)---> 4H2(g)O2(g) Is whatever I've done above …
  3. chemistry

    Write a balanced chemical equation for the reaction that occurs when Mg(s)reacts with Cl2(g). Express your answer as a balanced chemical equation. Identify all of the phases in your answer.
  4. Chemical Equations

    Starting with nitrogen and hydrogen, millions of kilograms of ammonia are produced every year for use as a fertilizer. Use this info to answer the next 3 questions. Communicate the balanced chemical equation using molecular models. …
  5. chemistry

    3. Answer the following questions: For each question show a balanced chemical equation and show all calculation for full credit. a. Assume that you had 100 nuts (N) and 75 bolts (B). How many NB molecules could you make by screwing …
  6. chemistry

    Write a balanced chemical equation for the reaction that occurs when barium carbonate decomposes into barium oxide and carbon dioxide gas when heated. Express your answer as a balanced chemical equation. Identify all of the phases …
  7. chemistry

    Based on the following chemical equation, answer the questions below. Show all your calculation The balanced chemical reaction of iodine with hydrogen sulfide is as follows: H2S(g)+I2(s)-----2HI(g) + S(s) (a) Based on the above chemically …
  8. chemistry

    Write a balanced chemical equation for the reaction that occurs when dimethylether, , is combusted in air. Express your answer as a balanced chemical equation. Identify all of the phases in your answer.
  9. Chemistry

    Hello, I really don't understand how to find the grams of moles in some of these reactions. If someone could help I would appreciate it. 1) Balance the following chemical reaction and determine the number of moles of HI produced when …
  10. chemistry

    Answer the following questions based on the following electrochemical reaction: Al(s) + Cu 2+(aq) <====> Cu(s) + Al3+ (aq) Write the balanced chemical equation for this cell. I'm confused.. how would this be balanced?

More Similar Questions